JPS58200691A - Speaker driving device - Google Patents
Speaker driving deviceInfo
- Publication number
- JPS58200691A JPS58200691A JP8351282A JP8351282A JPS58200691A JP S58200691 A JPS58200691 A JP S58200691A JP 8351282 A JP8351282 A JP 8351282A JP 8351282 A JP8351282 A JP 8351282A JP S58200691 A JPS58200691 A JP S58200691A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- speaker
- phase
- amplifier
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は低音域特性の改善を目的とするスピーカー駆動
装置、に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker driving device for improving bass characteristics.
一般に、動電型スピーカーの機械系等価回路は第１図に
示すようになり、そして、機械系の運動方程式は、
Ｍｏ、＝ ＋ Ｒｍｚ ＋ Ｓｏｘ ＝ Ｆ
（１まただし Ｒｅ：ボイスコイルの直流抵抗
Ｍｏ：振動系の等画質量
Ｃｏ：振動系の等価コンプライアンス
Ｓｏ：振動系の等価スチフネス（１／ｃＯ）Ｒｍ：振動
系の機械抵抗
ム 二 Ｂ （！、積
Ｘ ：ボイスコイルの変位
ｉ ：ボイスコイルの速度
ｉ ：ボイスコイルの加速度
Ｆ ：ボイスコイルの駆動力
となり、ここで、
Ｆ−ム・工
ただし 工 ニスビーカー電流
である。Generally, the mechanical equivalent circuit of an electrodynamic speaker is shown in Figure 1, and the equation of motion of the mechanical system is: Mo, = + Rmz + Sox = F
(1) Re: Direct current resistance of the voice coil Mo: Equivalent mass of the vibration system Co: Equivalent compliance of the vibration system So: Equivalent stiffness of the vibration system (1/cO) Rm: Mechanical resistance of the vibration system M2 B (! , product
一方、電気系等価回路（第２図）において、Ｅ０＝ ｌ
−Ｒｅ十ムｉ
ただし ＥＯ：入力端子
であるので、
となる。これを（１）式に代入すると、運動方程式はと
なる。On the other hand, in the electrical equivalent circuit (Figure 2), E0 = l
-Re 0mui However, since EO: is an input terminal, it becomes. Substituting this into equation (1), the equation of motion becomes:
そして、動電型スピーカーの場合、音圧は振動となる。In the case of an electrodynamic speaker, sound pressure becomes vibration.
すなわち、振動系を理想化して８つの領域に分けて考察
すると、
（１） Ｍｏω＞ （重陽子ム”／Ｒｅ）、Ｍ□ｃ＋＋
）Ｓ＠／ （ＩＩの領舛が質量制御領域で、音圧は入力
電圧と同相比例し、周波数特性は平坦である。That is, if we idealize the vibration system and consider it by dividing it into eight regions, (1) Moω> (deuteron m''/Re), M□c++
)S@/ (The region of II is the mass control region, the sound pressure is in phase proportional to the input voltage, and the frequency characteristics are flat.
（２） （Ｒｍ＋ム７Ｒｅ ）＞ Ｍ□ω、（Ｒｍ＋ム
７Ｒｅ ） ＞ Ｓ ｏ／（ＩＩの領域が、抵抗制御領
域で、音圧の位相は入力電圧より９０度進み、周波数特
性は５ ｄ１７ｏｃｔの傾斜をもつ。(2) (Rm+Mu7Re)>M□ω, (Rm+Mu7Re)>S o/(II region is the resistance control region, the phase of the sound pressure leads the input voltage by 90 degrees, and the frequency characteristic is 5 d17oct has a slope of
（（） Ｓｏ／ ω＞ （Ｒｍ＋ Ａ７Ｒｅ ）、Ｓｏ
／’ ” ＞ Ｍ６ｔａの領域が弾性制御領域で、音圧
の位相は入力電圧と逆相で、周波数特性は１２ ｄＢｌ
ｏａｔの傾斜をもつ。(() So/ω> (Rm+A7Re), So
/' ” > The region of M6ta is the elastic control region, the phase of the sound pressure is opposite to the input voltage, and the frequency characteristic is 12 dBl.
It has a slope of oat.
また、低域共振周波数ｆｏの近傍は抵抗制御領域に属し
、第８図に示すように音圧の位相は低域共振周波数ｆＯ
の両側で反転し、その位相角は、ただし Ｒｏ＝ Ｒｍ
＋ムＲ７Ｒ８
となる。′また、音圧の位相特性は機械抵抗Ｒｍに対し
て図のように変化する。In addition, the area near the low resonant frequency fo belongs to the resistance control region, and as shown in Figure 8, the phase of the sound pressure changes to the low resonant frequency fO.
is reversed on both sides, and its phase angle is, where Ro= Rm
+MuR7R8. 'Furthermore, the phase characteristics of the sound pressure change as shown in the figure with respect to the mechanical resistance Rm.
以」−に考察したように、動電型スピーカーの場合、最
低共振周波数ｆＯの上側の領域では入力電圧に対する周
波数特性および音圧の位相変化は比較的平坦で、波形伝
送は良好であるが、最低共振周波数ｆＯの近傍およびそ
れ以下の領域では音圧の位相変化が大きくなり、忠実な
波形伝送ができない。As discussed below, in the case of electrodynamic speakers, in the region above the lowest resonant frequency fO, the frequency characteristics and sound pressure phase change with respect to input voltage are relatively flat, and waveform transmission is good; In the vicinity of the lowest resonant frequency fO and in the region below it, the phase change of the sound pressure becomes large, making it impossible to transmit faithful waveforms.
ところでへ通常の楽音は過渡的なものが大部分であり、
この過渡的な信号は極端な場合は直流成分までも含んで
いるため、忠実な波形伝送を行なうためには、最低共振
周波数ｆＯを下げて位相変化の比較的平坦な領域で波形
伝送を行なえばよいが、実際には、スピーカーの機械的
構造上の制約から最低共振周波数ｆｏの低ＦＶｃＩ／ｉ
自ずから限度がある。By the way, most of the normal musical sounds are transient.
In extreme cases, this transient signal may even include a DC component, so in order to transmit a faithful waveform, it is necessary to lower the lowest resonant frequency fO and transmit the waveform in a region where the phase change is relatively flat. However, in reality, due to the mechanical structure constraints of the speaker, the lowest resonant frequency fo has a low FVcI/i.
There are limits of course.
従来は、最低共振周波数ｆ、 ｏを下げるために、振動
系の等価質閂ＭＯを増大させることがよく行なわれるが
、この場合、振動系のＱが必然的に増大し、過渡応答特
性が劣化する。Conventionally, in order to lower the lowest resonant frequencies f and o, it is often done to increase the equivalent quality MO of the vibration system, but in this case, the Q of the vibration system inevitably increases and the transient response characteristics deteriorate. do.
また、上記のように抵抗制御領域では入力電圧に対して
音圧の位相が９０度進むために、音圧波形は人力電化の
周波数スペクトラムに対して高域でのスペクトラムが増
大し、歪みが増大する。In addition, as mentioned above, in the resistance control region, the phase of the sound pressure advances by 90 degrees with respect to the input voltage, so the sound pressure waveform increases in the high frequency spectrum compared to the frequency spectrum of human-powered electrification, resulting in increased distortion. do.
本発明はこのような従来欠点を改良したもので、以丁図
において説明する。The present invention improves on these conventional drawbacks, and will be explained in the following figures.
本発明を第４図において説明すると、増幅器（１）の出
力にコンデンサＣと抵抗Ｒの並列回路からなるインピー
ダンス回路（２）を介して動電型スピーカー（３）の正
側端子を接続し、このスピーカー（３）の負側端子を負
性抵抗回路（４）を介して接地し、かつＪ増幅器（１）
の出力電圧を位相回路（５）を介して負性抵抗回路（４
）に正帰還した構成である。To explain the present invention with reference to FIG. 4, the positive terminal of an electrodynamic speaker (3) is connected to the output of the amplifier (1) via an impedance circuit (2) consisting of a parallel circuit of a capacitor C and a resistor R. The negative terminal of this speaker (3) is grounded via a negative resistance circuit (4), and the J amplifier (1)
The output voltage of is passed through the phase circuit (5) to the negative resistance circuit (4).
) with positive feedback.
ｌ−記負性抵抗回路（４）は公知のＢ級ブツシュグル型
負性抵抗回路が採用され、所定の周波数（最低共振周波
数ｆｏの近傍）以下の領域で、ボイスコイルの直流抵抗
Ｒｅと等価な負性抵抗を有するように設定される。すな
わち、本実施例では帰還ループ内に所定の周波数のカッ
トオフ周波数ｆＣを有するローパスフィルタ（６）を挿
入し、第５図に示すようにカットオフ周波数ｆｃ以下の
領域で負性抵抗を有し、したがって、ボイスコイルの直
流抵抗Ｒｅとの合成抵抗は同図点線（Ｒ；）で示すよう
になる。The negative resistance circuit (4) employs a well-known class B Bushgur type negative resistance circuit, and has a resistance that is equivalent to the DC resistance Re of the voice coil in a region below a predetermined frequency (near the lowest resonant frequency fo). It is set to have negative resistance. That is, in this embodiment, a low-pass filter (6) having a predetermined cutoff frequency fC is inserted in the feedback loop, and as shown in FIG. , Therefore, the combined resistance with the DC resistance Re of the voice coil is shown by the dotted line (R;) in the figure.
また、位相回路（５）ｔｉＯＲローパスフィルタを２段
縦続接続したものを採用し、その位相特性は第６図実線
ムに示すような特性を有し、最低共振周波数ｆＯで９０
度位相が遅れる。また、その振幅特性はカットオフ周波
数ｆｃ（＝ｆｏ）から６ｄＢでダクンするため、第８図
の入力電圧に対する８圧の位相特性（第６図点線Ｂ）と
の合成特性ｔま同図実線Ｃに示すようになり、最低共振
周波数ｆＯにおける音圧の位相進みはほとんどなくなる
。なお、本実施例における位相回路（５）は第６図に示
すような位相特性を有するが、ＯＲ口−パスフィルタの
各定数を適当に設定することにより、スピーカー駆動装
置の設計仕様に応じて任意の位相特性を得ることができ
る。In addition, a phase circuit (5) in which two stages of tiOR low-pass filters are connected in series is adopted, and its phase characteristics have the characteristics shown in the solid line in Fig. 6, and the lowest resonant frequency fO is 90
The degree phase is delayed. In addition, since the amplitude characteristic decreases by 6 dB from the cutoff frequency fc (= fo), the composite characteristic t with the phase characteristic of 8 voltages for the input voltage in Fig. 8 (dotted line B in Fig. 6) is the same as the solid line C in the same figure. As shown in the figure, the phase advance of the sound pressure at the lowest resonant frequency fO is almost eliminated. The phase circuit (5) in this embodiment has a phase characteristic as shown in FIG. 6, but by appropriately setting each constant of the OR port-pass filter, Any phase characteristic can be obtained.
以下、本発明の動作を第７図の等価回路に基いて説明す
る。The operation of the present invention will be explained below based on the equivalent circuit shown in FIG.
本発明の等価回路は、第２図の等価回路において入力電
圧ＥＯに対してインピーダンス回路（２）のインピーダ
ンス２、負性抵抗を示す電圧源−Ｋ＞Ｉおよび位相回路
（５）による位相補償電圧源−Ｋ ２ Ｅ ｏｌφが直
列に接続された形となり、Ｅｏ＝Ｉ−Ｚ＋ｌ−Ｒｅ＋ム
）Ｃ−ＫＩＩ−ＫｇＥＯ？φ （４）ただし −１
８０°くφ＜−９０＠（ｆｏ以下の領域）となる。
：′
ここで、負性抵抗はボイスコイルの直流抵抗Ｒｅと等価
な抵抗値を示すので、すなわち、Ｒｅ＝Ｋｌであるので
、上式は、
となる。The equivalent circuit of the present invention is as follows: In the equivalent circuit of FIG. 2, the impedance of the impedance circuit (2) is 2 with respect to the input voltage EO, the voltage source −K>I exhibiting negative resistance, and the phase compensation voltage by the phase circuit (5). The sources −K 2 E olφ are connected in series, and Eo=I−Z+l−Re+mu)C−KII−KgEO? φ (4) However -1
80 degrees, φ<-90@ (area below fo).
:' Here, since the negative resistance indicates a resistance value equivalent to the DC resistance Re of the voice coil, that is, Re=Kl, the above equation becomes as follows.
ここで、ボイスコイルの加速度は、 ・・ ｄｘ 、 ・ ８＝１ｒ″′″ｅ″８ であるので、上式は、 となる。Here, the acceleration of the voice coil is ・・ dx ・ 8=1r″′″e″8 Therefore, the above formula is becomes.
＝ム（−＋ｊωＣ） （Ｅｏ＋に２Ｅ□／φ）（６）と
なる。=mu(-+jωC) (2E□/φ in Eo+) (6).
（６）式と（１）式を比較すると、本発明は従来例に比
較して、等酒質量２．等価機械抵抗およびボイスコイル
駆動力が異な□る。すなわち、
（１）振動系の等酒質量ＭＯは
１、；＝ＭＯ−１−（Ｊ”
となり、見掛は上増大するので、最低共振周波数ｆらは
となり、従来の最低共振周波数ｆ。Comparing Equation (6) and Equation (1), the present invention has the same amount of alcoholic beverages as 2.0 compared to the conventional example. The equivalent mechanical resistance and voice coil driving force are different. That is, (1) The constant mass MO of the vibration system becomes 1, = MO-1-(J'', and the apparent increase increases, so the lowest resonant frequency f becomes the conventional lowest resonant frequency f.
に対して低ドする。また、インピーダンス回路（２）の
コンデンサＣの値Ｃを調節することにより最低共振周波
数ｆ二を変化させて最適の値にすることができる。Low de against. Further, by adjusting the value C of the capacitor C of the impedance circuit (2), the lowest resonance frequency f2 can be changed to an optimum value.
（２）最低共振周波数ｆ０における共振のＱはで与えら
れ、等酒質量（Ｍｏ ＋ＯＡ” ） の増大に伴って
Ｑは増大するが、インピーダンス回路（２）の抵抗Ｒの
値を調節することにより、共振のＱをＦげることができ
る。換言すれば、等酒質量の増大に伴う共振のＱの増大
を補償することができるすなわち、本発明において、イ
ンピーダンス回路のコンデンサＣの値の増大に伴って最
低共振周波数がＦがり、また、抵抗Ｒの値の減少に伴っ
て最低共振周波数での共振のＱが下がり、コンデンサＣ
１抵抗Ｒの値を適当に設定することにより、最低共振周
波数を丁げ、かつ、この領域を臨界制動またはこれに近
い理想的な特性を実現でき、低音再生域の拡大をはかる
ことができる。(2) The resonance Q at the lowest resonance frequency f0 is given by, and the Q increases as the alcohol mass (Mo + OA) increases, but by adjusting the value of the resistance R of the impedance circuit (2), , the resonance Q can be increased by F. In other words, it is possible to compensate for the increase in the resonance Q due to an increase in the amount of alcohol. As the value of the resistor R decreases, the Q of the resonance at the lowest resonant frequency decreases, causing the capacitor C to decrease.
By appropriately setting the value of one resistor R, it is possible to lower the lowest resonance frequency and achieve critical damping or ideal characteristics close to this in this region, thereby expanding the bass reproduction range.
（８）また、増幅器（１）の出力電圧が位相回路（５）
を通して負性抵抗回路（４）に正帰還されるので、スピ
ーカー（８）の両端に印加される電圧は、第８図（ｂ）
に示すように入力電圧（第８図（ａ））に対して位相が
遅れる。この位相遅れは電気音響変換時の位相進みによ
って元の状態となり、最低共振周波数ｆ。およびその近
傍の領域では入力電圧と音圧とはほぼ同相となる。なお
、第８図は過渡応答特性を明確にさせる単一トーンバー
スト波を人力した場合の例である。(8) Also, the output voltage of the amplifier (1) is connected to the phase circuit (5)
Since the voltage applied to both ends of the speaker (8) is positive feedback to the negative resistance circuit (4) through the
As shown in FIG. 8, the phase lags behind the input voltage (FIG. 8(a)). This phase delay returns to its original state due to the phase advance during electroacoustic conversion, and the lowest resonance frequency f. The input voltage and the sound pressure are almost in phase in the area near the input voltage. Incidentally, FIG. 8 is an example in which a single tone burst wave is manually generated to clarify the transient response characteristics.
すなわち、本発明では位相補償がなされる結果、最低共
振周波数ｆ０およびその近傍の領域におい−Ｃ人力電Ｊ
Ｅ （増幅器の出力電圧）と音圧波形とがほぼ同相にな
るので、入力電化と音圧波形の周波数スペクトラムがほ
ぼ同一になり、歪みが著しく減少する。That is, in the present invention, as a result of phase compensation, -C human power electric J
Since E (the output voltage of the amplifier) and the sound pressure waveform are almost in phase, the frequency spectra of the input voltage and the sound pressure waveform are almost the same, and distortion is significantly reduced.
以−１−のように、本発明は、増幅器（１）の出力にイ
ンピーダンス回路（２）を介して動電型スピーカー（８
）の正側端子を接続し、当該動電型スピーカー（３）の
負側端子を所定の周波数領域でｌ記動電型スピーカー（
８）のボイスコイル直流抵抗と等価な負性抵抗をもつ負
性抵抗回路（４）を介して接地し、かつ、上記増幅器（
１）の出力電圧を位相回路（５）を介して上記負性抵抗
回路（４）に正帰還したので、最低共振周波数における
共振のＱを増大させることなく最低共振周波数を下げて
低音再生域を拡大することができ、かつ、最低共振周波
数およびその近傍の領域で入力電圧と音圧波形がほぼ同
相になり歪みが低減される優れた利点を有する。As described below-1-, the present invention connects an electrodynamic speaker (8) to the output of an amplifier (1) via an impedance circuit (2).
), and connect the negative terminal of the electrodynamic speaker (3) in a predetermined frequency range to the electrodynamic speaker (3).
It is grounded via a negative resistance circuit (4) having a negative resistance equivalent to the voice coil DC resistance of (8), and the amplifier (
Since the output voltage of 1) is positively fed back to the negative resistance circuit (4) through the phase circuit (5), the lowest resonant frequency can be lowered to improve the bass reproduction range without increasing the resonance Q at the lowest resonant frequency. It has the excellent advantage that it can be expanded, and that the input voltage and sound pressure waveform are almost in phase at the lowest resonant frequency and its vicinity, reducing distortion.
第１図は動電型スピーカーの機械系等価回路、第２図は
同、電気系等価回路、第８図はき圧の位相特性図、第４
図は本発明のスピーカー駆動装置の構成を示す図、第５
図は同、負性抵抗回路の特性図、第６図は同、位相回路
の特性と音圧の位相特性を示す図、第７図は同、電気系
等価回路、第８図は同、波形説明図である。
（１）は増幅器、（２）はインピーダンス回路、（８）
は動電型スピーカー、（４）は負性抵抗回路、（５）ｔ
ｉ位相回路である。
特許出願人 オンキヨー株式会社
代理人 弁理士 佐 當 彌太部
才Ｆ３囮
−４９３−Figure 1 is the mechanical equivalent circuit of the electrodynamic speaker, Figure 2 is the electrical equivalent circuit, Figure 8 is the phase characteristic diagram of the pumping pressure, and Figure 4 is the mechanical equivalent circuit of the electrodynamic speaker.
Figure 5 shows the configuration of the speaker driving device of the present invention.
Figure 6 is the same, a diagram showing the characteristics of the negative resistance circuit, Figure 6 is the same, a diagram showing the characteristics of the phase circuit and phase characteristics of sound pressure, Figure 7 is the same, electrical system equivalent circuit, Figure 8 is the same, waveform It is an explanatory diagram. (1) is an amplifier, (2) is an impedance circuit, (8)
is an electrodynamic speaker, (4) is a negative resistance circuit, (5) t
This is an i-phase circuit. Patent Applicant Onkyo Co., Ltd. Agent Patent Attorney Sato Yatabe Sai F3 Decoy-493-
Claims (1)
て動電型スピーカー（３）の正側端子を接続し、当該動
電型スピーカー（８）の負側端子を所定の周波数領域で
上記動電型スピーカー（８）のボイスコイル直流抵抗と
等価な負性抵抗をもつ負性抵抗回路（４）を介して接地
し、かつ、上記増幅器（１）の出力電圧を位相回路（５
）を介して上記負性抵抗回路（４）に正帰還したことを
特徴とするスピーカー駆動装置。The positive terminal of the electrodynamic speaker (3) is connected to the output of the amplifier (1) via the impedance circuit (2), and the negative terminal of the electrodynamic speaker (8) is connected to the output of the amplifier (1) through the impedance circuit (2). It is grounded via a negative resistance circuit (4) having a negative resistance equivalent to the voice coil DC resistance of the electric speaker (8), and the output voltage of the amplifier (1) is connected to the phase circuit (5).
) A speaker driving device characterized in that positive feedback is provided to the negative resistance circuit (4) through the negative resistance circuit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8351282A JPS58200691A (en) | 1982-05-17 | 1982-05-17 | Speaker driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8351282A JPS58200691A (en) | 1982-05-17 | 1982-05-17 | Speaker driving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58200691A true JPS58200691A (en) | 1983-11-22 |
| JPH0480600B2 JPH0480600B2 (en) | 1992-12-18 |
Family
ID=13804533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8351282A Granted JPS58200691A (en) | 1982-05-17 | 1982-05-17 | Speaker driving device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58200691A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272297A (en) * | 1988-04-25 | 1989-10-31 | Yamaha Corp | Driving device |
| WO2024070656A1 (en) * | 2022-09-29 | 2024-04-04 | Ａｇｃ株式会社 | Glass diaphragm equipped with vibrator, control system for glass diaphragm equipped with vibrator, and control program for glass diaphragm equipped with vibrator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138122A (en) * | 1976-03-24 | 1977-11-18 | Stahl Karl Erik | Method of improving low frequency speaker reproduction and device therefor |
| JPS54103214U (en) * | 1977-12-28 | 1979-07-20 | ||
| JPS5829295A (en) * | 1981-08-12 | 1983-02-21 | Onkyo Corp | Loudspeaker driving device |
-
1982
- 1982-05-17 JP JP8351282A patent/JPS58200691A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52138122A (en) * | 1976-03-24 | 1977-11-18 | Stahl Karl Erik | Method of improving low frequency speaker reproduction and device therefor |
| JPS54103214U (en) * | 1977-12-28 | 1979-07-20 | ||
| JPS5829295A (en) * | 1981-08-12 | 1983-02-21 | Onkyo Corp | Loudspeaker driving device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272297A (en) * | 1988-04-25 | 1989-10-31 | Yamaha Corp | Driving device |
| JPH0728471B2 (en) * | 1988-04-25 | 1995-03-29 | ヤマハ株式会社 | Drive |
| WO2024070656A1 (en) * | 2022-09-29 | 2024-04-04 | Ａｇｃ株式会社 | Glass diaphragm equipped with vibrator, control system for glass diaphragm equipped with vibrator, and control program for glass diaphragm equipped with vibrator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0480600B2 (en) | 1992-12-18 |
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